UNIX GCC <FCNTL.H> есть:
макрос: int O_NONBLOCK

This prevents open from blocking for a "long time" to open the file. This is only meaningful for some kinds of files, usually devices such as serial ports; when it is not meaningful, it is harmless and ignored. Often opening a port to a modem blocks until the modem reports carrier detection; if O_NONBLOCK is specified, open will return immediately without a carrier.

В Win32  <FCNTL.H> подобного макроса не хранит. Не в курсе, может он называется иначе?

Это сообщение отредактировал(а) vdm - 2.5.2010, 16:35